A EPA
United States
Environmental Protection
Agency
Revisions to the Unregulated Contaminant
Monitoring Rule for the Fifth Monitoring Cycle
(UCMR 5): Public Meeting and Webinar
Held April 6 and 7, 2021 USEPA, Office of Ground Water and
Drinking Water
Office of Water (MLK 140)
EPA 815-A-21 -001
April 2021

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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Revisions to the Unregulated Contaminant
Monitoring Rule for the Fifth Monitoring
Cycle (UCMR 5)
Public Meeting by Webinar
April 6 and 7, 2021
U.S. EPA
Office of Ground Water and Drinking Water
Welcome
Greg Carroll, U.S. EPA
Office of Ground Water and Drinking Water
Standards and Risk Management Division
Technical Support Center

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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Agenda
Day 1/Day 2 (Eastern Time)
Topics
8:45-9:00am / 12:45-l:00pm
Log into the Meeting
9:00-9:10am / l:00-l:10pm
Welcome, Logistics, Agenda
9:10-9:25am/ l:10-l:25pm
Overview of the UCMR Program
9:25-9:45am / l:25-l:45pm
The Proposed UCMR 5
9:45-10:15am / l:45-2:15pm
UCMR 5 Proposed Contaminants and Methods
10:15-10:20am / 2:15-2:20pm
Representative Sampling
10:20-10:30am / 2:20~2:30pm
UCMR 5 Reporting
10:30-10:45am / 2:30-2:45pm
Break
10:45-ll:15am / 2:45-3:15pm
Laboratory Approval Process & MRLs
ll:15-12:15pm / 3:15-4:15pm
Stakeholder Statements & Discussion
12:15-12:30pm / 4:15-4:30pm
Submitting Public Comments & Closing Remarks
April 2021	U.S. Environmental Protection Agency	Slide 3 of 139
Webinar Tips
•	Webinar Slides
•	Located under "Handouts" in the right navigation bar on your
screen
•	Slides contain all content that will be discussed
•	Webinar Audio
•	Listen only mode until the discussion at the end
•	Webinar Support
•	Send email to UCMRWebinar@cadmusgroup.com
• e.g., "I can hear you speaking, but I cannot see the slides."
April 2021	U.S. Environmental Protection Agency	Slide 4 of 139
Page 2 of 70

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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Questions on the Presentation
•	Click on "+" next to "Questions" in
the control panel (Figure 1) to
submit questions/comments
•	Type a question in the box; click send
(Figure 2)
•	Submit general clarifying questions
throughout the webinar
•	Questions will be answered in the che
box throughout the presentation
•	Common questions will be answered
the end of each section
April 2021	U.S. Environmental Protection Agency	Slide 5 of 139
Specific PWS & Laboratory Questions about UCMR 5
•	Public Water System (PWS)-Specific Questions
•	UCMR Sampling Coordinator@epa.gov
•	"My water system has five entry points, but we share three of
those points with another water system. Where do I sample?"
•	Laboratory-Specific Questions
•	UCMR Lab Approval@epa.gov
•	"My laboratory merged with another laboratory since the last
UCMR cycle, can we change our laboratory ID?"
April 2021	U.S. Environmental Protection Agency	Slide 6 of 139
Figure 1
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Figure 2
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Page 3 of 70

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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Comments on the UCMR 5 Proposed Rule
•	Go to http://www.regulations.gov
•	Enter Docket ID EPA-HQ-GW-2020-0530
•	Click Search button
April 2021	U.S. Environmental Protection Agency	Slide 7 of 139
Comment Process/Accessing Docket
The UCMR 5 docket
should pop up on the
next screen
Click on the Comment
button below the
Proposed Rule
E3 PROPOSED RULE
Revisions to the Unregulated Contaminant Monitoring
Rule for Public Water Systems; Public Meeting
Comments Due May 10.2021
April 2021
U.S. Environmental Protection Agency
Slide 8 of 139
Page 4 of 70

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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Comment Process/Accessing Docket
•	Enter comment and all
required information
on next screen
•	Upload a document by
clicking on the
Browse... button
•	Click on the Submit
Comment button at
the bottom of the
page
April 2021	U.S. Environmental Protection Agency	Slide 9 of 139
Comment Process/Accessing Docket
•	Once submitted, comments cannot be edited or removed
•	Do not electronically submit any information you consider
to be Confidential Business Information (CBI)
•	Multimedia submissions (audio, video, etc.) must be
accompanied by a written comment
• Written comment is considered the official comment and
should include discussion of all points you wish to make
•	EPA public comment policy is at:
http://www.epa.gov/dockets/commenting-epa-dockets
•	Comments/questions/statements raised during this
meeting are not registered as official public comments
April 2021	U.S. Environmental Protection Agency	Slide 10 of 139
Write a Comment
Read Agency Guidelines | Commenter's Checklist
Comment"
Start typing comment here
5000
Attach Files
You can attach up to 20 files, but each fUe cannot exceed 10MB Valid file
types include, bmp, docx. gif, jpg jpeg, pdf, png, pptx. rtf, sgml, tif, tiff. txt. wpd,
xlsx. xmL
Page 5 of 70

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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
General Meeting Information
•	Purpose
•	Announce the UCMR 5 proposal for public comment
•	Provide an opportunity for stakeholders to learn and discuss
aspects of the UCMR 5 proposal:
•	Monitoring requirements
•	Analyte selection and rationale
•	Analytical methods
•	Representative monitoring
•	Reporting requirements
•	Laboratory approval process
•	Webinar lines are muted to minimize background noise
•	Discussion at the end of the webinar
April 2021	U.S. Environmental Protection Agency	Slide 11 of 139
Overview of the Unregulated
Contaminant Monitoring Rule Program
Brenda Bowden, U.S. EPA
Office of Ground Water and Drinking Water
Standards and Risk Management Division
Technical Support Center
Page 6 of 70

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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Overview
• Regulatory background for UCMR, relationship to
other Safe Drinking Water Act (SDWA) programs
•	Contaminant Candidate List (CCL)
•	The Unregulated Contaminant Monitoring Rule
(UCMR)
•	UCMR objective
•	History of UCMR
•	Regulatory Determinations
•	National Primary Drinking Water Regulations
(NPDWRs)
•	Six-Year Review
April 2021	U.S. Environmental Protection Agency	Slide 13 of 139
The Safe Drinking Water Act (SDWA)
•	Enacted in 1974, the SDWA authorized the Environmental
Protection Agency (EPA) to set enforceable health standards
for contaminants in drinking water
•	National Primary Drinking Water Regulations (NPDWRs)
•	The 1986 SDWA amendments were the basis for the original
"UCM" program
•	State drinking water programs managed the original UCM program
•	Public Water Systems (PWSs) serving > 500 people were required
to monitor
•	The 1996 SDWA amendments changed the process of
developing and reviewing NPDWRs
•	CCL
•	UCMR (EPA~managed)
•	Regulatory Determination
•	Six-Year Review
April 2021	U.S. Environmental Protection Agency	Slide 14 of 139
Page 7 of 70

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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
General Flow of the SDWA Regulatory Processes
CCL
+t
UCMR Monitoring
Results
UCMR
Regulatory
Determination
Preliminary
Regulatory
Determinations
Final Regulatory
Determinations
No further action required if
decision is to not regulate
May develop health advisory
Rule
Public Review and Comment
•^Research Needs Assessment
Review
	
Proposed Rule
f
(NPDWR)

ฆ
i
I
ฆ
1 18
^ months

Bs
Final Rule

Six-Year Review of
(NPDWR)

Existing NPDWRs
Increased specificity and confidence in the type of supporting data used (e.g., health, occurrence, treatment) is needed at each stage
April 2021
U.S. Environmental Protection Agency
Slide 15 of 139
The Contaminant Candidate List (CCL)
The SDWA 1412(b)(1)(B) required EPA to establish a
listing of contaminants that are:
•	Not subject to any proposed or promulgated
NPDWR
•	Known or anticipated to occur in PWSs
•	May require regulation under the SDWA
List must be published every 5 years
The Final CCL 4 was published November 17, 2016 and
includes 97 chemicals or chemical groups and 12 microbes
April 2021
U.S. Environmental Protection Agency
Slide 16 of 139
Page 8 of 70

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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
General Flow of the SDWA Regulatory Processes
CCL
f
—n—
N

Draft UCMR
If

\


Final UCMR


\


UCMR Monitoring
Results
ฆ

UCMR
J
Regulatory
Determination
Preliminary
Regulatory
Determinations
Rule
Public Review and Comment
•^Research Needs Assessment
Review
Y
24

Final Regulatory
months
Proposed Rule
Determinations

(NPDWR)
No further action required if
decision is to not regulate
May develop health advisory
!2k
Six-Year Review of
Existing NPDWRs
Increased specificity and confidence in the type of supporting data used (e.g., health, occurrence, treatment) is needed at each stage
April 2021
U.S. Environmental Protection Agency
Slide 17 of 139
The Unregulated Contaminant
Monitoring Rule (UCMR)
The SDWA section 1445(a)(2), as amended in 1996,
established requirements for the UCMR Program:
•	Issue a list of no more than 30 priority unregulated contaminants
in drinking water, once every 5 years
•	Require PWSs serving a population >10,000 people as weii as a
nationally representative sample of small PWSs serving <10,000
people to monitor
•	Make analytical results publicly available in the National
Contaminant Occurrence Database for Drinking Water (NCOD)
•	The EPA funds shipping/analytical costs for small PWSs
The EPA manages program in partnership with States,
tribes, and territories (hereafter referred to as "States")
that volunteer to assist
April 2021
U.S. Environmental Protection Agency
Slide 18 of 139
Page 9 of 70

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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Objective of the UCMR Program
• Collect nationally representative occurrence data
for unregulated contaminants that may require
regulation under the SDWA
•	Consider data collected as part of future EPA decisions on
actions to protect public health
•	Provide data to States, local governments, and to the public
for their use in decisions regarding public health protection
National occurrence data publicly available:
http://www.epa.gov/dwucmr/occurrence-data-unregulated-
contaminant-monitoring-rule
April 2021	U.S. Environmental Protection Agency	Slide 19 of 139
History of the UCMR
•	UCMR 1 (2001-2005)
•	Published in Federal Register (FR) on September 17,1999
•	UCMR 2 (2007-2011)
•	Published in FR on January 4, 2007
•	UCMR 3 (2012-2016)
•	Published in FR on April 16, 2012
•	UCMR 4 (2017-2021)
•	Published in FR on December 20, 2016
•	PWSs collected samples 2018-2020
•	UCMR 5 (2022-2026)
•	Proposed rule published on March 11, 2021 (86 FR 13846)
•	Anticipates PWSs collecting samples 2023-2025
Each new UCMR cycle is established via a revision to the rule for the
ongoing/preceding cycle
April 2021	U.S. Environmental Protection Agency	Slide 20 of 139
Page 10 of 70

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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
General Flow of the SDWA Regulatory Processes
CCL
f~~—;	>
Regulatory
Determination
Preliminary
Regulatory
Determinations
UCMR Monitoring
Results
UCMR
Final Regulatory
Determinations
No further action required if
decision is to not regulate
May develop health advisory
Public Review and Comment
•^Research Needs Assessment
Review



Six-Year Review of

Existing NPDWRs
Increased specificity and confidence in the type of supporting data used (e.g., health, occurrence, treatment) is needed at each stage
April 2021
U.S. Environmental Protection Agency
Slide 21 of 139
•	Every five years, the Administrator shall, after notice of the
preliminary determination and opportunity for public comment,
for not fewer than five contaminants included on the CCL, make
determinations on whether to regulate such contaminants
•	The SDWA requires the EPA to publish a maximum contaminant
level goal (MCLG) and promulgate a NPDWR for a contaminant if
the Administrator determines that:
1.	The contaminant may have an adverse effect on the health of persons;
2.	The is known to occur or there is substantial likelihood that the
contaminant will occur in PWSs with a frequency and at levels of public
health concern; and
3.	In the sole judgment of the Administrator, regulation of such
contaminant presents a meaningful opportunity for health risk reduction
for persons served by PWSs
*SDVZA Section 1412(b)(1)
April 2021	U.S. Environmental Protection Agency	Slide 22 of 139
Page 11 of 70

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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
General Flow of the SDWA Regulatory Processes
CCL
Regulatory
Public Review and Comment
•^Research Needs Assessment
Review
UCMR Monitoring
Results
UCMR
May develop health advisory
!2k
Six-Year Review of
Existing NPDWRs
Increased specificity and confidence in the type of supporting data used (e.g., health, occurrence, treatment) is needed at each stage
April 2021
U.S. Environmental Protection Agency
Slide 23 of 139
National Primary Drinking Water Regulations
(NPDWR)
•	For each contaminant that the Administrator determines to
regulate, the Administrator shall publish MCLGs and promulgate,
by rule, NPDWRs. The Administrator shall:
•	Propose the MCLG and NPDWRs for a contaminant not later than
24 months after the determination to regulate
•	Publish a MCLG and promulgate a NPDWR within 18 months after
the proposal thereof
*	A NPDWR shall take effect three years after the date on which the
regulation is promulgated. The Administrator, or a State, may
allow this period to be extended up to two additional years if it
determines that additional time is necessary for capital
improvements
April 2021	U.S. Environmental Protection Agency	Slide 24 of 139
Page 12 of 70

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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
General Flow of the SDWA Regulatory Processes
CCL
Regulatory
Public Review and Comment
•^Research Needs Assessment
Increased specificity and confidence in the type of supporting data used (e.g., health, occurrence, treatment) is needed at each stage
April 2021
U.S. Environmental Protection Agency
Slide 25 of 139
Six-Year Review
The SDWA Section 1412(b)(9) requires review and
revision, as appropriate, of each NPDWR not less often
than every six years. The review includes:
• Re-evaluation of health effects, occurrence, exposure,
analytical methods, treatment feasibility, risk-balancing and
implementation issues
Any revision of a NPDWR shall maintain, or provide for
greater, protection of the health of persons
April 2021
U.S. Environmental Protection Agency
Slide 26 of 139
Page 13 of 70

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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
The Proposed UCMR 5
Brersda Bowden, U.S. EPA
Office of Ground Water and Drinking Water
Standards and Risk Management Division
Technical Support Center
•	America's Water Infrastructure Act (AWIA)
•	National Defense Authorization Act (NDAA)
•	Sampling and statistical design
•	PWS types
•	UCMR monitoring tiers
•	Applicability
•	Sampling schedules
•	Sampling frequency and locations
•	Timeline of activities
•	Implementation roles
•	Cost estimates
April 2021	U.S. Environmental Protection Agency	Slide 28 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
America's Water Infrastructure Act (AWIA) of 2018
•	The SDWA was amended in 2018 by Public Law 115-270
•	AWIA section 2021
•	Enacted October 23, 2018
•	Key changes to the UCMR (SDWA section 1445(j)):
•	Require PWSs serving between 3,300 and 10,000 to monitor
•	Ensure that only a representative sample of PWSs serving fewer than 3,300
people monitor
•	Limitations:
•	Subject to the availability of appropriations and sufficient laboratory capacity to
accommodate the analyses
•	Authorization of Appropriations:
•	Additional $15,000,000 in each fiscal year for which sampling is required to be
carried out
•	Under the AWIA provisions, EPA continues to be responsible for all
analytical costs associated with monitoring at systems serving 10,000 or
fewer people
April 2021	U.S. Environmental Protection Agency	Slide 29 of 139
National Defense Authorization Act (NDAA)
for Fiscal Year 2020
• Section 7311 of the NDAA (Public Law 116-92) requires
EPA to include each Per- and Polyfluoroalkyl Substance
(PFAS) in UCMR 5 for which a drinking water method
has been validated by the Administrator and that are
not subject to a NPDWR
Page 15 of 70

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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Sampling and Statistical Design
•	Design vetted with stakeholders, peer reviewed
and undergone four rounds of public comment
•	Data Quality Objectives for the Representative
Sample
•	Provides occurrence data for unbiased national
exposure estimates
•	The statistical design:
•	Stratifies by system size and source water type
•	Allocates PWSs across the strata proportional to population
served with at least two PWSs allocated to each State
April 2021	U.S. Environmental Protection Agency	Slide 31 of 139
Selection of Nationally Representative PWSs
The document "Selection of Nationally Representative Public Water Systems for the
Unregulated Contaminant Monitoring Rule: 2020 Update" is available in the docket
•	Updates the 2001 statistical design document
•	Describes:
•	Refinement to the UCMR program monitoring tiers
•	Selection of representative PWSs for Assessment Monitoring
and Survey Monitoring
•	Changes in statistical design to address the AWIA requirements
•	Development of State Monitoring Plans that identify specific
PWSs participating in the UCMR and establish sampling
schedules
April 2021	U.S. Environmental Protection Agency	Slide 32 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
PWS Types
• PWS: provides water for human consumption through pipes or
other constructed conveyances to at least 15 service connections
or serves an average of at least 25 people for at least 60 days a
year
•	Community Water System (CWS)
—	PWS that supplies water to the same population year-round
•	Non-Transient Non-Community Water System
(NTNCWS)
—	PWS that supplies water to at least 25 of the same people at
least six months per year but not year-round (e.g., schools)
•	Transient Non-Community Water System (TNCWS)
(not generally included in UCMR sampling)
—	PWS that provides water where people do not remain for long
periods of time (e.g., gas stations, campgrounds)
April 2021	U.S. Environmental Protection Agency	Slide 33 of 139
UCMR Monitoring Tiers
•	UCMR approach relies on using one or more of 3 monitoring
tiers:
•	Assessment Monitoring (primary approach to-date)
•	Screening Survey
•	Pre-Screen Testing
•	Based on:
•	Availability and complexity of analytical methods
•	Laboratory capacity
•	Sampling frequency
•	Characteristics of PWSs performing the monitoring
•	Other considerations (e.g., cost/burden)
•	Assessment Monitoring is the only tier proposed for UCMR 5
April 2021	U.S. Environmental Protection Agency	Slide 34 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Assessment Monitoring
•	Primary design objective is to determine national contaminant
occurrence in PWS-supplied drinking water for the purpose of
estimating national population exposure
•	Primary tier and largest in scope
•	Generally relies on analytical methods that use more common
techniques and are expected to be widely available
•	Consistent with the AWIA provisions, Assessment Monitoring
proposed for UCMR 5 includes:
•	Nationally representative sample of 800 small systems serving fewer than
3,300 persons
•	Census of small systems serving between 3,300 and 10,000 persons
•	Census of large systems serving > 10,000 persons
•	Sampling design is population weighted
•	Total number of systems: ~10,300
April 2021	U.S. Environmental Protection Agency	Slide 35 of 139
UCMR 5 Applicability to PWSs per AWIA
Small Systems
(25-3,299)
800 randomly selected systems
(CWSs and NTNCWSs)
800
Small Systems
(3,300 -10,000)
Large Systems
All systems (CWSs and NTNCWSs) ~5,100
All systems (CWSs and NTNCWSs) ~4,400
(10,001 and over)
TOTAL
10,300
1 Systems provide water for human consumption through pipes or other constructed conveyances to at least 15 service
connections or serves an average of at least 25 people for at least 60 days a year
April 2021
U.S. Environmental Protection Agency
Slide 36 of 139
Page 18 of 70

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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Sampling Schedules
•	EPA initially drafts schedules for large and small PWSs
•	Partnered State has opportunity to review and
modify schedules for large and small PWSs
•	Large PWS has opportunity to review and modify
their schedule
•	Small PWS may request that EPA modify their
schedule
April 2021	U.S. Environmental Protection Agency	Slide 37 of 139
Sampling Frequency & Locations
•	The UCMR 5 proposal identifies sampling frequencies
and locations consistent with those used in UCMR 1 -
UCMR 4
•	Surface Water systems (including those using ground water
under the direct influence of surface water) sample four times
(~3 months apart) during their year of sampling
•	Ground Water systems sample two times (5-7 months apart)
during their year of sampling
•	Sampling is proposed at the entry points to the
distribution systems (EPTDSs)
April 2021	U.S. Environmental Protection Agency	Slide 38 of 139
Page 19 of 70

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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
2018
2019
2020
2021


Publish Final Rule

Method
Development
Stakeholder
Meeting (June 6,
2018)
Pre-Proposal
Stakeholder Meeting
(July 16, 2019)
Applicability date February 1,
2021
Publish Proposal, 60-day Public
Comment Period, Stakeholder
Meeting (April 6 & 7, 2021)
Publish UCMR 5 Final
Rule (Anticipated
Dec 2021)


Post Proposal: Initiate Implementation
Lab Approval Program
SDWARS registration/notification/inventory for PWSs
Partnership Agreements, State Monitoring Plans,
PWS Inventory
Ground Water Representative Monitoring Plans
(GWRMP) submitted to EPA six months prior to the
PWS's scheduled sample collection
Outreach/trainings
April 2021	U.S. Environmental Protection Agency	Slide 39 of 139
2022
2023 2024 2025
2026
Pre-sampling Activity

Post-sampling
by EPA
Sampling Period
Activity
• Manage Lab
•^^^^^EPA Implementation Activities
PWSs, Laboratories
Approval Program
Provide compliance assistance
• Complete
• Organize
Implement small system monitoring
resampling, as
Partnership
Post data quarterly to NCOD
needed
Agreements and

Conclude data
State Monitoring
PWS Sample Collection; Laboratory Analysis;
reporting
Plans
Reporting

• Begin PWS SDWARS
• All large systems serving more than 10,000
EPA
registration/
people;
Complete upload
inventory
All small systems serving between 3,300
of UCMR 5 data
• Review GWRMP
and 10,000 people;
to NCOD
submittal
800 small systems serving fewer than

• Conduct
3,300 people

outreach/trainings


April 2021	U.S. Environmental Protection Agency	Slide 40 of 139
20
Page 20 of 70

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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
EPA Implementation Roles
•	Small PWS support:
•	Maintain lab and implementation contracts to support the
UCMR
•	Compile contact and inventory information
•	Manage sample kit distribution and tracking
•	Responsible for data review and reporting
•	Large arid Small PWS support:
•	Extract data from the Safe Drinking Water Accession and Review
System (SDWARS) for evaluation and reporting to the National
Contaminant Occurrence Database for Drinking Water (NCOD)
•	Support the SDWARS reporting system and users
•	Perform inventory and schedule updates
•	Provide technical assistance
•	Use SDWARS for real-time communication and outreach
April 2021	U.S. Environmental Protection Agency	Slide 41 of 139
EPA Implementation Roles (Cont.)
• State, PWS, and Laboratory support:
•	Review and track PWS applicability and sampling progress
•	Coordinate Laboratory Approval Program
•	Provide technical support
•	Coordinate outreach
•	Compliance assistance and enforcement efforts
April 2021
U.S. Environmental Protection Agency	Slide 42 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Extended UCMR Implementation Team
•	EPA Office of Ground Water and Drinking Water
(OGWDW)
•	Lead organization for direct-implementation of rule
•	EPA Regional Offices
•	Coordinate State Partnership Agreements
•	Assist States and PWSs with UCMR requirements,
compliance assistance, and enforcement
•	Partnering States
•	Support various aspects of implementation based on
state-specific interest
April 2021	U.S. Environmental Protection Agency	Slide 43 of 139
States' Role in the UCMR Program
•	Participation by States is voluntary and documented via
Partnership Agreements
•	States help the EPA implement the UCMR program; help to
ensure high data quality
•	Partnership Agreement activities can include any/all of the
following:
•	Review and revise State Monitoring Plans
•	Provide inventory and contact information for small and large PWSs
•	Review proposed Ground Water Representative Monitoring Plans
(GWRMPs)
•	Provide compliance assistance (e.g., notify and instruct systems)
•	Collect samples
•	Other
April 2021	U.S. Environmental Protection Agency	Slide 44 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
EPA Responsibilities on behalf of Small PWSs
•	EPA funds costs associated with analyses and shipping for
small PWSs (i.e., those serving 10,000 or fewer people)
•	EPA engages States and PWSs to collect samples
•	EPA coordinates sample analyses with contracted
laboratories and funds the analyses
•	EPA examines the results along with quality control (Q.C)
data and makes results available via SDWARS
April 2021
U.S. Environmental Protection Agency	Slide 45 of 139
Large PWS Responsibilities
•	PWSs serving more than 10,000 people are responsible for
the costs associated with analyses
•	PWS coordinates sample analyses with an approved
laboratory
•	Laboratories post the data to SDWARS
•	PWS reviews and can act upon (e.g., approve) data in
SDWARS
•	States have access to results following large PWS review
period
April 2021
U.S. Environmental Protection Agency	Slide 46 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
UCMR 5 Cost Estimates
Estimated Average Annual Costs of the Proposed UCMR 5 Over the Five-year Cycle1
Entity
Avg. Annual Cost
(Million) (2022-2026)2
Small Systems (25-10,000), including labor3 only (non-labor costs4 paid for by
the EPA)
SO. 3
Large Systems (10,001-100,000), including labor and non-labor costs
$7.2
Very Large Systems (100,001 and greater), including labor and non-labor costs
$2.3
States, including labor costs related to implementation coordination
$0.8
EPA, including labor for implementation and non-labor for small system testing
$10.5
AVERAGE ANNUAL NATIONAL TOTAL (over the period of 2022-2026)
$21.1
1.	Based on the scope of small-system monitoring described in AWIA.
2.	Totals may not equal the sum of components due to rounding.
3.	Labor costs pertain to systems, States, and EPA. Costs include activities such as reading the rule, notifying systems selected to participate,
sample collection, data review, reporting and record keeping.
4.	Non-labor costs will be incurred primarily by EPA and by large and very large PWSs. They include the cost of shipping samples to laboratories
for testing and the cost of the laboratory analyses.
April 2021	U.S. Environmental Protection Agency	Slide 47 of 139
UCMR 5 Proposed Contaminants and
Analytical Methods
Melissa Simic, U.S. EPA
Office of Ground Water and Drinking Water
Standards and Risk Management Division
Technical Support Center

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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Overview
•	Candidate selection process and rationale
•	Proposed contaminants and analytical methods
•	Health and occurrence data sources
•	Contaminant-specific information by method
•	Other contaminants considered during
development of UCMR 5 proposal
•	Information Compendium
April 2021
U.S. Environmental Protection Agency	Slide 49 of 139
118 contaminants on CCL 4+ 339 method related
non-CCL 4 contaminants (includes contaminants
monitored for under UCMRs 1,2,3 or 4)
= 457 contaminants
21 contaminants on CCL4+ 187 method
related non-CCL4 contaminants
= 208 contaminants
All contaminants on the CCL 4
Other contaminants within the scope of
methods for CCL 4 contaminants
All contaminants previously monitored under
the UCMR 1, 2, 3, or 4
12 CCL 4+19 workgroup nominations
+ 38 method related non-CCL4 contaminants
= 69 contaminants
[13 methods]
Not currently regulated or previous regulatory
determination
May occur in drinking water
Not monitored for on UCMR 1,2,3, or 4 (with the
exception of PFAS)
Expected to have a completed, validated drinking
water method in time for rule proposal
30 contaminants
proposed
for comment
Additional contaminant attributes:
• Have an available health assessment to facilitate
regu latory determinations
Have high public interest (e.g., PFAS)
Are addressed in EPA's PFAS Action Plan
Are specified in Section 7311 of NDAA
Have critical health endpoints, probable carcinogens
Have active use (e.g., registered pesticides)
April 2021	U.S. Environmental Protection Agency	Slide 50 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
PFAS as UCMR 5 Candidate Contaminants
•	National Defense Authorization Act for Fiscal Year 2020 (NDAA)
(Public Law 116-92)
•	"The EPA Administrator shall include each PFAS in UCMR 5 for which a
drinking water method has been validated by the Administrator and that
are not subject to a NPDWR"
•	EPA's 2019 Per- and Polyfluoroalkyl Substances (PFAS) Action Plan:
https://www.epa.gov/pfas/epas-pfas-action-plan
•	UCMR 5 Commitment: The EPA will propose nationwide drinking water
monitoring for PFAS under the next UCMR monitoring cycle utilizing
newer methods available to detect more PFAS chemicals and at lower
minimum reporting levels (MRLs) than previously possible in earlier
monitoring
•	Proposal included all 29 PFAS that are within the scope of EPA Methods
533 and 537.1. Six of the 29 PFAS were part of UCMR 3. UCMR 5
monitoring for those six would involve lower MRLs
April 2021	U.S. Environmental Protection Agency	Slide 51 of 139
EPA Method 533
1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
4,8-dioxa-3H-perfluorononanoic acid (ADONA)
1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
Hexafluoropropylene oxide dimeracid (HFPO-DA) (GenX)
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
Perfluorobutanesulfonic acid (PFBS)
Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
Perfluorodecanoic acid (PFDA)
Pertluoro (2-ethoxyethane) sulfonic acid (PFEESA)
Perfluorododecanoic acid (PFDoA)
Pertluoro-3-methoxypropanoic acid (PFMPA)
Perfluoroheptanoic acid (PFHpA)
Perfluoro-4-methoxybutanoic acid (PFMBA)
Perfluorohexanoic acid (PFHxA)
Perfluorobutanoic acid (PFBA)
Perfluorohexanesulfonic acid (PFHxS)
Perfluoroheptanesulfonicacid (PFHpS)
Perfluorononanoic acid (PFNA)
Pertluoropentanesulfonic acid (PFPeS)
Perfluorooctanesulfonic acid (PFOS)
Perfluoropentanoic acid (PFPeA)
Perfluorooctanoicacid (PFOA)
ll-chloroeicosafluoro-3-oxaundecane-l-sulfonic acid (HCI-PF30UdS)
Perfluoroundecanoic acid (PFUnA)
9-chlorohexadecafluoro-3-oxanone-l-sulfonic acid (9CI-PF30NS)
PFAS Analytes Unique to EPA Method 537.1
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
Perfluorotetradecanoic acid (PFTA)
N-methyl perfiuorooctanesulfonamidoacetic acid (NMeFOSAA)
Perfluorotridecanoic acid (PFTrDA)
EPA Method 200.7 or alternate SM 3120 B or ASTM D1976-20
Lithium
Bold= PFAS monitored under UCMR 3
Page 26 of 70

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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
EPA Health Assessment Data Sources
The Health Values are:
•	Not federally enforceable
•	Subject to change as health effects information becomes available
Office of Research and Development
•	Integrated Risk Information System (IRIS)
https://cfpub.epa.gov/ncea/iris drafts/AtoZ.cfm
•	Provisional Peer-Reviewed Toxicity Values (PPRTVs)
https://www.epa.gov/pprtv/provisional-peer-reviewed-toxicity-
values-pprtvs-assessments
Office of Water
•	Health Advisory (HA) or Health Effects Support Documents (HESD)
https://www.epa.gov/dwstandardsregulations/drinking-water-
contaminant-human-health-effects-information
April 2021
U.S. Environmental Protection Agency
Slide 53 of 139
Non-EPA Health Data Sources
Available non-EPA health assessments were also considered, e.g.
•	Agency for Toxic Substances and Disease Registry (ATSDR)
•	Toxicological Profiles
https://www.atsdr.cdc.gov/toxprofiledocs/index.html
•	World Health Organization (WHO)
•	International Agency for Research on Cancer (IARC) Monographs
https://monographs.iarc.fr/
•	Health Canada
•	Guidelines for Canadian Drinking Water Quality
https://www.canada.ca/en/health-canada/services/environmental-
workplace-health/reports-publications/water-qualitv.html#tech doc
•	Center for Disease Control and Prevention's
•	Morbidity and Mortality Weekly Reports (MMWR)
https://www.cdc.gov/mmwr/index.html
April 2021
U.S. Environmental Protection Agency
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Occurrence Data Sources
Finished Water Data
•	Unregulated Contaminant Monitoring Rule (UCMR) (UCMR 3)
(2013-2015)
•	National Inorganics and Radionuclides Survey (NIRS) (1984 -
1986)
•	Disinfection Byproduct Information Collection Rule (DBP-ICR)
Data (1997 -1998)
•	State and Local Occurrence Studies
Supplemental Drinking Water and Ambient Water Data
•	U.S. Geological Survey (USGS), Ambient Water
• National Water-Quality Assessment Program (NAWQA)
April 2021	U.S. Environmental Protection Agency	Slide 55 of 139
Other Data Sources
•	Persistent, Bioaccumulative and Toxic (PBT) Profiler
•	Chemical Data Reporting (CDR) under the Toxic Substance
Control Act (TSCA)
•	Interstate Technology Regulatory Council (ITRC)
•	EPA's CompTox Chemicals Dashboard
•	Hazardous Substances Data Bank (HSDB)
April 2021
U.S. Environmental Protection Agency	Slide 56 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Per- and Polyfluorinated Alky I Substances
EPA Method 5331 (SPE LC/MS/MS)
Location: EPTDS
Analyte
Health Information
Critical Health
Effect
Occurrence
1 l-chloroeicosafluoro-3-
oxauridecane-l-sulfonic acid
(llCl-PF30UdS)
No EPA health assessment
NA
No occurrence data available in the
data sources reviewed
1H, 1H, 2H, 2H-perfluorodecane
sulfonic acid (8:2 FTS)
No EPA health assessment
NA
No occurrence data available in the
data sources reviewed
1H, 1H, 2H, 2H-perfluorohexarie
sulfonic acid (4:2 FTS)
No EPA health assessment
NA
No occurrence data available in the
data sources reviewed
1H, 1H, 2H, 2H-perfluorooctane
sulfonic acid (6:2 FTS)
No EPA health assessment
NA
No occurrence data available in the
data sources reviewed
1. Determination of Per- and Polyfluoroalkyl Substances in Drinking Water by Isotope Dilution Anion Exchange Solid Phase Extraction and Liquid
Chromatography/Tandem Mass Spectrometry. November 2019.
April 2021
U.S. Environmental Protection Agency
Slide 57 of 139
Per- and Polyfluorinated Alky I Substances
EPA Method 533 (SPE LC/MS/MS)
Location: EPTDS
Analyte
Health Information
Critical Health
Effect
Occurrence
4,8-dioxa-3H-perfluorononanoic
acid (ADONA)1
No EPA health assessment
NA
No occurrence data available in the
data sources reviewed
9-chlorohexadecafluoro-3-
oxanone-l-sulfonic acid (9CI-
PF30NS)
No EPA health assessment
NA
No occurrence data available in the
data sources reviewed
hexafluoropropylene oxide dimer
acid (HFPO-DA) (GenX)
2018 Draft EPA Toxicity Values2:
Draft Candidate Chronic
Reference Dose (RfD) = 0.00008
mg/kg-day
Draft Candidate Subchronic RfD =
0.0002 mg/kg-day
NA
No occurrence data available in the
data sources reviewed
1.4,8-dioxa-3H-perfluorononanoic acid is
2. Draft EPA Toxicity Assessment, 2018
the parent acid form of the ammonium salt


April 2021
U.S. Environmental Protection Agency
Slide 58 of 139
Page 29 of 70

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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Per- and Polyfluorinated Alky! Substances
EPA Method 533 (SPE LC/MS/MS)
Location: EPTDS
Analyte
Health Information
Critical Health
Effect
Occurrence
nonafluoro-3,6-dioxaheptanoic
No EPA health
NA
No occurrence data available in the data
acid (NFDHA)
assessment

sources reviewed
perfluoro (2-ethoxyethane)
No EPA health
NA
No occurrence data available in the data
sulfonic acid (PFEESA)
assessment

sources reviewed
perfluoro-3-methoxypropanoic
No EPA health
NA
No occurrence data available in the data
acid (PFMPA)
assessment

sources reviewed
perfluoro-4-methoxybutanoic
No EPA health
NA
No occurrence data available in the data
acid (PFMBA)
assessment

sources reviewed
April 2021
U.S. Environmental Protection Agency
Slide 59 of 139
Per- and Polyfluorinated Alky I Substances
EPA Method 533 (SPE LC/MS/MS)
Location: EPTDS
Analyte
Health Information
Critical Health
Effect
Occurrence
perfluorobutanesulfonic
acid (PFBS)
EPA PPRTV12014: Chronic Provisional
Reference Dose (p-RfD) = 0.02 mg/kg-day;
Subchronic p-RfD = 0.2 mg/kg-day
Draft EPA Toxicity Values, 20182:
Draft Candidate Chronic RfD = 0.01 mg/kg-
day (thyroid or kidney)
Draft Candidate Subchronic RfD = 0.04
(thyroid) and 0.1 mg/kg-day (kidney)
Increased incidence of
kidney hyperplasia
UCMR 33: Detected in 0.16% of PWSs at
concentrations greater than or equal to
0.09 ug/L (Minimum Reporting Level
[MRL]).
Boone et al., 20194: Detected in 96% of
partially treated samples from 25 PWSs;
median detected 0.00117 ug/L
perfluorobutanoic acid
(PFBA)
EPA Integrated Risk Information System
(IRIS) assessment in process
NA
Boone et al., 2019: Detected in 88% of
partially treated samples from 25 PWSs;
median detected 0.00362 ug/L
perfluorodecanoic acid
(PFDA)
EPA IRIS assessment in process
NA
Boone et al., 2019: Detected in 52% of
partially treated samples from 25 PWSs;
median detected 0.00033 ug/L.
1.	EPA Provisional Peer-Reviewed Toxicity Value (PPRTV), 2014
2.	D raft E PA Tox ic ity Assessme nt, 2 018
3.	UCMR 3, 2013-2015: Finished drinking water occurrence data
4.	Finished drinking water occurrence study. "Per- and polyfluoroalkyl substances in source and treated drinking waters of the United States." Science of The Total
Environment 653 (February 2 5) :3 59-369.
April 2021 U.S. Environmental Protection Agency Slide 60 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Per- and Polyfluorinated Alky! Substances
EPA Method 533 (SPE LC/MS/MS)
Location: EPTDS
Analyte
Health Information
Critical Health
Effect
Occurrence
perfluorododecanoic acid
(PFDoA)
No EPA health
assessment
NA
Boone et alv 20191: Detected in 4% of
partially treated samples from 25 PWSs;
median detected 0.00009 ug/L
perfluoroheptanesulfonic
acid (PFHpS)
No EPA health
assessment
NA
No occurrence data available in the data
sources reviewed
perfluoroheptanoic acid
(PFHpA)
No EPA health
assessment
NA
UCMR 32: Detected in 1.75% of PWSs at
greater than or equal to 0.01 ug/L (MRL)
Boone et al., 2019: Detected in 92% of
partially treated samples from 25 PWSs;
median detected 0.00079 ug/L
1.	Finished drinking water occurrence study. "Per- and polyfluoroalkyl substances in source and treated drinking waters of the United States." Science of The Total
En viron men f 653 (Fe b rua ry 25):359-369
2.	UCMR 3, 2013-2015: Finished drinking water occurrence data
April 2021	U.S. Environmental Protection Agency	Slide 61 of 139
Per- and Polyfluorinated Alky I Substances
EPA Method 533 (SPE LC/MS/MS)
Location: EPTDS
Analyte
Health Information
Critical Health
Effect
Occurrence
perfluorohexanesulfonic
Draft ATSDR1, 2018: provisional
Thyroid follicular
UCMR 32: Detected in 1.12% of PWSs at
acid (PFHxS)
Minimal Risk Level = 0.00002
mg/kg-day (intermediate
duration)
EPA IRIS assessment in process
cell damage
greater than or equal to 0.03 ug/L (MRL)
Boone etal., 20193: Detected in 80% of
partially treated samples from 25 PWSs;
median detected 0.00079 ug/L
perfluorohexanoic acid
EPA IRIS assessment in process
NA
Boone etal., 2019: Detected in 100% of
(PFHxA)


partially treated samples from 25 PWSs;
median detected 0.00143 ug/L
perfluorononanoic acid
Draft ATSDR, 2018: provisional
Decreased pup
UCMR 3: Detected in 0.28% of PWSs at
(PFNA)
Minimal Risk Level = 0.000003
body weight and
greater than or equal to 0.02 ug/L (MRL)

mg/kg-day (intermediate
duration)
developmental
delays
Boone, etal., 2019: Detected in 88% of
partially treated samples from 25 PWSs;

EPA IRIS assessment in process

median detected 0.00074 ug/L
1.	Draft Agency for Toxic Substances and Disease Registry (ATSDR), 2018: "Toxico logical Profile for Perfluoroa Iky Is"
2.	UCMR 3, 2013-2015: Finished drinking water occurrence data
3.	Finished drinking water occurrence study. "Per- and polyfluoroalkyl substances in source and treated drinking waters of the United States." Science of The Total
En viron men f 653 (Fe b rua ry 25):359-369
Page 31 of 70

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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Per- and Polyfluorinated Alky! Substances
EPA Method 533 (SPE LC/MS/MS)
Location: EPTDS
Analyte
Health Information
Critical Health Effect
Occurrence
perfluorooctanesulfonic acid
EPA HA1: 0.07 ug/L (chronic)
Reduced pup body weight in
UCMR 34: Detected in 1.93% of PWSs at
(PFOS)
EPA HESD2, 2016: RfD =
the two-generation study in
greater than or equal to 0.04 ug/L (MRL)

0.00002 mg/kg-day
rats
Boone et al., 20195: Detected in 80% of

Health Canada, 20183:

partially treated samples from 25 PWSs;

MAC = 0.6 ug/L

median detected 0.00162 ug/L
perfluorooctanoic acid
EPA HA1: 0.07 ug/L (chronic)
Pup reduced ossification
UCMR 3: Detected in 2.38% of PWSs at
(PFOA)

and accelerated male
greater than or equal to 0.02 ug/L (MRL)

EPA HESD2, 2016: RfD=
0.00002 mg/kg-day; 10 4
Cancer Risk = 50 ug/L
puberty, decreased
antibody protection and
increased adult kidney
weight with decreased body
Boone et al., 2019: Detected in 76% of
partially treated samples from 25 PWSs;
median detected 0.00415 ug/L

Health Canada, 20183:
weight


MAC = 0.2 ug/L


1.	EPA Health Advisory for PFOA and PFOS, 2016; Non-cancer health value; Not federally enforceable
2.	EPA Health Effects Support Document (HESD); Not federally enforceable
3.	Health Canada Guidelinesfor Canadian Drinking Water Quality, Maximum Acceptable Concentration (MAC); Not federally enforceable
4.	UCMR 3, 2013-2015: Finished drinking water occurrence data
5.	Finished drinking water occurrence study. "Per- and polyfluoroalkyl substances in source and treated drinking waters of the United States." Science of The Total
Environment 653 (February 25):359-369"
April 2021	U.S. Environmental Protection Agency	Slide 63 of 139
Per- and Polyfluorinated Alky I Substances
EPA Method 533 (SPE LC/MS/MS)
Location: EPTDS
Analyte
Health
Information
Critical Health
Effect
Occurrence
perfluoropentanesulfonic acid
(PFPeS)
No EPA health
assessment
NA
No occurrence data available in the data sources
reviewed
perfluoropentanoic acid
(PFPeA)
No EPA health
assessment
NA
Boone etal., 20191: Detected in 96% of partially
treated samples from 25 PWSs; median detected
0.00178 ug/L
perfluoroundecanoic acid
(PFUnA)
No EPA health
assessment
NA
Boone etal., 2019: Detected in 16% of partially
treated samples from 25 PWSs; median detected
0.00054 ug/L
Quinones and Snyder, 20092: The mean
concentration detected in 1 of 7 PWSs with varying
degrees of wastewater impact 0.0019 |ig/L (Detects
are concentrations greater than or equal to a
method reporting limit of 0.001 ug/L)
1.	Finished drinking water occurrence study. "Per- and polyfluoroalkyl substances in source and treated drinking waters of the United States." Science of The Total
En viron men 1653 (Fe b rua ry 25):359-369
2.	Finished drinking water occurrence study. "Occurrence of perfluoroalkyl carboxylates and sulfonates in drinking water utilities and related waters from the
United States." Environmental Science & Technology 43(24): 9089- 9095.
April 2021
U.S. Environmental Protection Agency Slide 64 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Per- and Polyfluorinated Alky! Substances
Using EPA Method 537.11 (LC/MS/MS)
Location: EPTDS
Analyte
Health Information
Critical
Health Effect
Occurrence
N-ethyl
perfluorooctariesulfonamidoacetic
acid (NEtFOSAA)
No EPA health
assessment
NA
No occurrence data available in the data
sources reviewed
N-methyl
perfluorooctanesulfonamidoacetic
acid (NMeFOSAA)
No EPA health
assessment
NA
No occurrence data available in the data
sources reviewed
Perfluorotetradecanoic acid
(PFTA)
No EPA health
assessment
NA
Boone et a I., 20192: Detected in 0% of
partially treated samples from 25 PWSs.
Perfiuorotridecanoic acid
(PFTrDA)
No EPA health
assessment
NA
Boone et a I., 2019: Detected in 0% of
partially treated samples from 25 PWSs.
1.	Determination of Selected Per- and Polyfluorinated Alky 1 Substances in Drinking Water by Solid Phase Extraction and Liquid Chromatography/Tandem Mass
Spectrometry (LC/MS/MS), Version 2.0. March 2020.
2.	Finished drinking water occurrence study. "Per- and polyfluoroalkyl substances in source and treated drinking waters of the United States." Science of The Total
En viron men f 653 (Fe b rua ry 25):359-369
April 2021
U.S. Environmental Protection Agency
Slide 65 of 139
Lithium (Metal/Pharmaceutical)
EPA Method 200.71 (ICP-AES)
Location: EPTDS

Analyte
Health Information
Critical Health Effect
Occurrence
Lithium
EPA PPRTV, 20082:
Adverse effects in several organs and
NIRS3: Detected in 551 of 988 (55.8%)


p-RFD = 0.002 mg/kg-
systems (e.g., kidney effects)
PWSs; detection range 5-7,929 ug/L


day (Chronic and

Glassmeyer et al., 20174:


Subchronic); lower

Detected in 56% of partially treated


bound of the

samples from 25 PWSs (mostly


therapeutic serum

surface water systems); median


concentration range

detected 10.8 H-g/L


selected as basis

l.
Determination of Metals and Trace Elements in Water and Wastes by Inductively Coupled Plasma-Atomic Emission Spectrometry, Revision 4.4. 1994
2.
EPA Provisional Peer-Reviewed Toxicity Value (PPRTV), 2008

3.
National Inorga
riics and Radionuclides Survey (NIRS), 1984-1986: Finished drinking water occurrence data

4.
Finished drinking water occurrence study. "Nationwide Reconnaissance of Contaminants of Emerging Concern in Source and Treated Drinking Waters of the

United States." Science of the Total Environment (581-582):909-922.

April 2021

U.S. Environmental Protection Agency
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Other Contaminants Considered
•	EPA considered four haloacetonitriles and Legionella pneumophila
for UCMR 5 monitoring but did not propose them for the reasons
described in the Federal Register Notice
•	EPA is examining opportunities to enhance protection against
disinfection byproducts (including haloacetonitriles) and Legionella
pneumophila through potential revisions to the suite of Microbial
and Disinfection Byproduct (MDBP) rules, including the Surface
Water Treatment Rule
•	EPA took into consideration that UCMR 5 data collection would not
be complete in time to inform regulatory revision to the MDBP
rules (an anticipated proposal date of July 31, 2024 and a final rule
date of September 30, 2027) and would not reflect conditions in
water systems after any regulatory revisions become effective
April 2021	U.S. Environmental Protection Agency	Slide 67 of 139
Other Contaminants Considered
• Inclusion of haloacetonitriles and/or Legionella pneumophila in
UCMR 5 would pose monitoring and reporting complexity and cost
compared to the sampling design for PFAS and lithium
•	Haloacetonitriles: new expense estimates of $16 million for
large PWSs, $20 million for EPA [to implement small system
monitoring], and $0.5 million for small PWSs and States over
the 5-year UCMR period
•	Legionella pneumophila: new expense estimates of $11 million
for large PWSs, $20 million for EPA [to implement small system
monitoring], and $0.5 million for small PWSs and States over
the 5-year UCMR period
April 2021	U.S. Environmental Protection Agency	Slide 68 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
EPA Method 551.1 (LLE/GC/ECD)1
Location: Distribution System
Analyte
Bromochloroacetonitril
e (BCAN)
Dichloroacetonitrile
(DCAN)
Health Information
Christ etal., 19952: Maternal no-observed-
adverse-effect level (NOAEL) of 45 mg/kg/day and
maternal lowest-observed-adverse-effect level
(LOAEL) of 65 mg/kg/day in rats when BCAN was
administered in tricaprylin; Maternal LOAEL of 5
mg/kg/day in rats, BCAN administered in
tricaprylin
Smith et al., 19864: LOAEL in rats of 55 mg/kg/day
when DCAN was administered in tricaprylin
(based)
Smith et al., 19895: Maternal and fetal NOAEL in
rats of 15 mg/kg/day when DCAN was
administered in tricaprylin
Critical Health Effect
Decreased maternal weight
and increased dam
mortality; Developmental
and teratogenic effects
Developmental toxicity
Increased liver weight in
the dams and decreased
fetal weight and length and
an increase in soft tissue
malformations, respectively
Occurrence
DBP-ICR3: Detected in
62.5% PWS; 50th
percentile = 0.7 ug/L, 90th
percentile = 2.6 ug/L
DBP-ICR: Detected in
70.1% PWSs; 50th
percentile = 1.3 ug/L, 90th
percentile = 4.4 ug/L
1.	Determination of Chlorination Disinfection Byproducts, Chlorinated Solvents, and Halogenated Pesticides/Herbicides in Drinking Water by Liquid-Liquid
Extraction and Gas Chromatography with Electron-Capture Detection, Revision 1.0,1995
2.	The developmental toxicity of bromochloroacetonitrile in pregnant Long-Evans rats. International Journal of Environmental Health Research 5(2):175-188.
3.	Disinfection Byproduct Information Collection Rule (DBP-ICR) Data (1997 - 1998): Distribution system occurrence data
4.	"Reproductive toxicology of disinfection by-products." Environmental Health Perspectives. 69:177-182.
5.	"Developmental toxicity of dichloroacetonitrile: a by-product of drinking water disinfection." Fundamental and Applied Toxicology. 12(4): 765-772.
April 2021	U.S. Environmental Protection Agency	Slide 69 of 139
EPA Method 551.1 (LLE/GC/ECD)
Location: Distribution System
Analyte
Dibromoacetonitrile
(DBAN)
Trichloroacetonitrile
(TCAN)
Health Information
Critical Health
Effect
Occurrence
WHO, 2004 TDI1: 0.11 mg/kg/day Decreased body DBP-ICR3: Detected in 48.6% PWSs;
WHO, 1999 IARC2 Cancer
Classification: Possibly carcinogenic
to humans (Group 2B)
Christ et al., 19964: NOAEL in rats of
35 mg/kg/day and a LOAEL of 55
mg/kg/day when TCAN was
administered in corn oil
WHO, 1999 IARC Cancer
Classification: Not classifiable as to
its carcinogenicity to humans
(Group 3)
weight in male
rats
Developmental
toxicity and
teratogenicity
50th percentile = <0.5 ug/L, 90th
percentile = 2.3 ug/L
DBP-ICR: Detected in 1.7% PWS;
50th percentile = <0.5 ug/L, 90th
percentile = <0.5 ug/L
1.	World Health Organization (WHO), Tolerable Daily Intake (TDI)
2.	International Agency for Research on Cancer (IARC)
B. Disinfection Byproduct Information Collection Rule (DBP-ICR) Data (1997- 1998): Distribution system occurrence data
4,	"Developmental effects of trichloroacetonitrile administered in corn oil to pregnant Long-Evans rats." Journal of Toxicology and Environmental Health 47(3):233-
47
April 2021
U.S. Environmental Protection Agency
Slide 70 of 139
Page 35 of 70

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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Method TBD
Location: Distribution System
Critical Health

Analyte Health Information
y Effect
Occurrence
Legionella MCLG1 = 0 Legionellosis, which
Donohue et al., 20192: Between 2011 and
pneumophila can be Legionnaires'
2017, 358 tap water samples were collected
disease (a form of
from 46 U.S. States and territories. Legionella
pneumonia;
was detected in 26% of chlorinated tap water
potentially fatal
samples and 22% of chloraminated tap water
illness) or Pontiac
samples. There was no significant difference in
Fever (a milder, flu-
detection frequency in hot-water or cold-
like illness)
water tap samples whether from chlorine- or

chloramine-treated water sources
1. Legionella pneumophila is regulated via "treatment technique" with a Maximum Contaminant Level Goal (MCLG) of zero established under
EPA's Surface Water Treatment Rule (54 FR 27486, June 1989)

2. Donohue et al., 2019: Finished drinking water occurrence study. "Impact on the Detection and Quantification of Legionella pneumophila and
Mycobacterium Species"

April 2021 U.S. Environmental Protection Agency Slide 71 of 139
Other Contaminants Considered
•	Total Organic Fluorine (TOF): While there is high interest in TOF (and other
techniques that might capture a broader suite of PFAS), the measurement
approach is subject to significant technical challenges, and a robust method
that would support national monitoring is unlikely to be ready in time to
support UCMR 5 rulemaking
•	1,2,3-tricholorpropane: Included in UCMR 3. At 0.03 ng/L, the MRL
established in UCMR 3 is higher than the EPA health reference level (HRL)
associated with a cancer risk level of one cancer case per million people
(0.0004 jig/L (0.4 ng/L), but lower than the cancer risk level associated with
one cancer case per 10,000 people (0.04 |ig/L))
• Available analytical methods would not support the collection of data at
concentrations lower than the levels monitored during UCMR 3
April 2021	U.S. Environmental Protection Agency	Slide 72 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
UCMR 5 Contaminants
• EPA invites public comments on:
•	The 30 proposed contaminants and
their associated methods
•	The additional contaminants
considered for UCMR 5, but not
included on the proposed list
•	Additional contaminants that may not
have been considered for UCMR 5
•	Additional consensus analytical
methods for the proposed
contaminants
Go to www.regulations.gov and enter Docket ID: EPA-HQ-OW-2020-0530
to submit public comments
April 2021	U.S. Environmental Protection Agency	Slide 73 of 139
Information Compendium for Candidate Contaminants
•	Provides supporting information for the 30 proposed contaminants, as well as
Legionella pneumophila and four haloacetonitriles
•	Used data sources from the Contaminant Candidate List (CCL) program to inform
•	Background & Use
•	Health Effects
•	Occurrence in Water
•	Production, Release, & Usage
•	Persistence & Mobility
•	Outlines the contaminant prioritization process
•	Summarizes the data sources reviewed
•	Includes a comprehensive list of the other contaminants that were considered,
but not included on the proposed list
The document "Information Compendium for Candidate Contaminants for the
Proposed Unregulated Contaminant Monitoring P.ule (UCMR 5)" is available in the
docket
April 2021	U.S. Environmental Protection Agency	Slide 74 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Representative Samples
(Optional)
Derek Losh, U.S. EPA
Office of Ground Water and Drinking Water
Standards and Risk Management Division
Technical Support Center
Overview
•	Ground Water Representative Monitoring Plan
(GWRMP) Program
•	Option for ground water systems to reduce monitoring
•	Representative connections
•	Option for water systems that purchase water with
multiple connections from the same wholesaler
April 2021
U.S. Environmental Protection Agency	Slide 76 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Ground Water Representative Monitoring
Plan (GWRMP) Program
• Applications from ground water systems now being accepted
•	PWSs with multiple ground water entry points to the distribution
system (EPTDSs) can sample at representative sampling locations
rather than at each EPTDS with EPA approval
•	Previously-approved plans may be used for UCMR 5 if there are
no significant changes in the configuration of the ground water
EPTDSs since prior approval
•	PWSs must prepare proposals for any new GWRMPs and submit
them to: UCMR Sampling Coordinator@epa.gov
The document "Instructions for Preparing a Ground Water Representative
Monitoring Plan for the Unregulated Contaminant Monitoring Rule" is
available in the docket
April 2021	U.S. Environmental Protection Agency	Slide 77 of 139
GWRMP Program
Key GWRMP Proposal Requirements:
•	Site map showing the locations of all wells and the
proposed representative wells. Generally,
represented wells should be located within a mile
of the representative well
•	Uniform contamination susceptibility among the
represented wells and their representative well
•	Historical ground water quality data
demonstrating similarity among the represented
wells and the representative well
April 2021	U.S. Environmental Protection Agency	Slide 78 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
GWRMP Program
GWRMPs approved under prior UCMRs
•	These may be used for UCMR 5 if there are no significant changes
in the configuration of the ground water EPTDSs since prior
approval. The PW5 must send a message to
UCMR Sampling Coordinatorffiepa.gov to confirm its intention to
use the previous GWRMP
•	If EPA does not have record of a previously-approved GWRMP,
EPA will contact the PWS to request that documentation
Amending GWRMPs
•	Requests for change must also be submitted to
UCMR Sampling Coordinator(5)epa.gov
•	If new wells are being added,, the amendment request must be
accompanied by the supporting information discussed on a
previous slide
April 2021	U.S. Environmental Protection Agency	Slide 79 of 139
GWRMP Program: Change Between
UCMR 4 and UCMR 5 Proposal
UCMR 4
UCMR 5 Proposed Change
UCMR 4 specifies "within 120 days
from publication of the final rule" as
the deadline to submit a GWRMP
As proposed, plans must be
submitted to EPA six months prior to
the PWS's scheduled sample
collection, instead of by a specified
date
Reason for considering change: Provides greater flexibility for
PWSs with ground water locations to complete the GWRMP
process. Those scheduled to collect samples in 2024 or 2025
would have significantly more time
April 2021	U.S. Environmental Protection Agency	Slide 80 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Representative Connections
• Representative Connections: Water systems that
purchase water with multiple connections from the
same wholesaler may select one representative
connection from that wholesaler
•	Do riot need EPA approval
•	Upload your representative connection to SDWARS
April 2021
U.S. Environmental Protection Agency	Slide 81 of 139
UCMR 5 Reporting
Jillian Toothman, U.S. EPA
Office of Ground Water and Drinking Water
Standards and Risk Management Division
Technical Support Center

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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Overview
•	SDWARS 5
•	Reporting requirements
•	Data elements
•	Timing of reporting
April 2021
U.S. Environmental Protection Agency	Slide 83 of 139
SDWARS 5
•	Safe Drinking Water Accession and Review System
(SDWARS) used by PWSs and EPA-approved
UCMR 5 laboratories to report results
•	Internet-based electronic reporting system that
utilizes a secure access portal, the Central Data
Exchange (CDX), to access SDWARS 5
•	SDWARS 5 user instructions and trainings for labs,
PWSs, and States will be available after the final
rule is published
April 2021	U.S. Environmental Protection Agency	Slide 84 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Large System Reporting ง141.35(c)
•	Contact and zip code information
•	SDWARS by December 31, 2022
•	Sampling location information
•	SDWARS by December 31, 2022
•	Changes after December 31, 2022 must be submitted to
UCMR Sampling Coordinator@epa.gov and approved by EPA
•	Data elements
•	PWSs must report all data elements specified in ง141.35(e) Table 1
(e.g., disinfectant type and treatment information) to SDWARS
•	Analytical results
•	Uploaded to SDWARS by the PWS' laboratory
•	Reviewed and submitted by PWS in SDWARS
April 2021	U.S. Environmental Protection Agency	Slide 85 of 139
Small System Reporting ง141.35(d)
•	Contact and zip code information
•	SDWARS by December 31, 2022
•	Sampling location information
•	SDWARS by December 31, 2022
•	Data elements
•	PWSs must report all data elements specified in ง141.35(e) Table 1
on each sample tracking form, in their sampling kit, as appropriate
•	Analytical results
•	Uploaded to SDWARS by EPA's contracted laboratory
•	Reviewed by EPA in SDWARS
•	Small PWSs and states will have access to results via SDWARS
April 2021	U.S. Environmental Protection Agency	Slide 86 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Reporting Data Elements ง141.35(e)
1. Public Water System Identification (PWSID) Code
15. Analytical Method Code
2. Public Water System Name
16. Extraction Batch Identification Code
3. Public Water System Facility Identification Code
17. Extraction Date
4. Public Water System Facility Name
18. Analysis Batch Identification Code
5. Public Water System Facility Type
19. Analysis Date
6. Water Source Type
20. Sample Analysis Type
7. Sampling Point Identification Code
21. Analytical Results—Sign
8. Sampling Point Name
22. Analytical Result—Measured Value
9. Sampling Point Type Code
23. Additional Value
10. Disinfectant Type (Additional Details)
24. Laboratory Identification Code
11. Treatment Information (AdditionalDetails)
25. Sample Event Code
12. Sample Collection Date
26. Historical Information for Contaminant Detections and
Treatment (Additional Details)
13. Sample Identification Code
TJ. Potential PFAS Sources (AdditionalDetails)
14. Contaminant
28. Direct Potable Reuse Water Information (Additional
Details)
Data elements PWS reports at sample collection

Updated data element
April 2021
U.S. Environmental Protection Agency
Slide 87 of 139
Disinfectant Type - Data Element 10
All of the disinfectants/oxidants that have been added prior to and at
the entry point to the distribution system. Please select all that apply:
PEMB = Permanganate
HPXB = Hydrogen peroxide
CLGA = Gaseous chlorine
CLOF = Offsite generated hypochlorite
(stored as a liquid form)
CLON = Onsite generated hypochlorite
CAGC = Chloramine (formed with
gaseous chlorine)
CAOF = Chloramine (formed with
offsite hypochlorite)
CAON = Chloramine (formed with
onsite hypochlorite)
CLDB = Chlorine dioxide
OZON = Ozone
ULVL = Ultraviolet light
OTHD = All other types of
d is i nfecta nt/oxida nt
NODU = No disinfectant/oxidant used
April 2021
U.S. Environmental Protection Agency
Slide 88 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Treatment Information - Data Element 11
Treatment information associated with the sample point. Please select all that apply.
CON = Conventional (non-softening, consisting of at
least coagulation/sedimentation basins and
filtration)
SFN = Softening
RBF = River bank filtration
PSD = Pre-sedimentation
INF = In-line filtration
DFL = Direct filtration
SSF = Slow sand filtration
BIO = Biological filtration (operated with an
intention of maintaining biological activity within
filter)
UTR = Unfiltered treatment for surface water source
GWD = Groundwater system with disinfection only
PAC = Application of powder activated carbon
• GAC = Granular activated carbon adsorption (not
part of filters in CON, SFN, INF, DFL, or SSF)
April 2021	U.S. Environmental Protection Agency
AIR = Air stripping (packed towers, diffused
gas contactors)
POB = Pre-oxidation with chlorine (applied
before coagulation for CON or SFN plants or
before filtration for other filtration plants)
MFL = Membrane filtration
I EX = Ionic exchange
DAF = Dissolved air floatation
CWL = Clear well/finished water storage
without aeration
CWA = Clear well/finished water storage with
aeration
ADS = Aeration in distribution system
(localized treatment)
OTH = All other types of treatment
NTU = No treatment used
DKN = Do not know
Slide 89 of 139
No = have never tested for the
contaminant
DK = I do not know
Historical Information for Contaminant
Detections and Treatment - Data Element 26
A yes or no answer provided by the PWS for each entry point to the distribution system
Question: Have you tested for the contaminant in your drinking water in the past?
* YES = If yes, did you modify your
treatment and if so, what types of
treatment did you implement? Select
all that apply.
•	PAC = Application of powder
activated carbon
•	GAC = Granular activated carbon
adsorption (not part of filters in
CON, SCO, INF, DFL, or SSF)
•	Biologically Active Carbon
•	MFL = Membrane filtration
•	ULVL = Ultraviolet light
•	Other
U.S. Environmental Protection Agency
April 2021
Slide 90 of 139
Page 45 of 70

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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Potential PFAS Sources - Data Element 2.
A yes or no answer provided by the PWS for each entry point to the distribution system
Question: Are you aware of any potential current and/or historical sources of PFAS that may have
impacted the drinking water sources at your water system?
= If yes, select all that apply:
MB = Military Base
FT = Firefighting training school
AO = Airport Operations
CW = Car Wash or Industrial Launderers
PS = Public Safety Activities (e.g., fire and rescue
services)
WM = Waste Management
HW = Hazardous waste collection, treatment and
disposal, Underground Injection Well
SC = Solid waste collection, combustors, incinerators
MF = Manufacturing
FP = Food Packaging
TA = Textile and Apparel (e.g., stain- and water-
resistant, fiber/thread, carpet, house furnishings,
leather)
PP = Paper
•	CC = Chemical
•	PR = Plastics and Rubber Products
•	MM = Machinery
•	CE = Computer and Electronic Products
•	FM = Fabricated Metal Products (e.g., nonstick
cookware)
•	PC = Petroleum and Coal Products
•	FF= Furniture
•	OG = Oil and Gas Production
•	UT = Utilities (e.g., sewage treatment facilities)
•	CT = Construction (e.g., wood floor finishing,
electrostatic painting)
•	OT = Other
No = I am not aware of any potential current and/or
historical sources
DK =I do not know
April 2021
U.S. Environmental Protection Agency
Slide 91 of 139
Direct Potable Reuse Water Information -
Data Element 28
A yes or no answer provided by the PWS for each entry point to the distribution
system
Question: Do you use direct potable reuse as a source of water?
Yes = If yes, what is the blending ratio when used?
Enter blending ratio at sample point
No = do not use direct potable reuse water
April 2021
U.S. Environmental Protection Agency	Slide 92 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Timing of Reporting:
Change Between UCMR 4 and UCMR 5 Proposal
Adjust the number of days between sample collection and laboratory posting of data and
adjust the number of days for PWS review of data posted by their laboratory (40 CFR
141.40(c)(6)(H) Reporting Schedule and 40 CFR 141.40(a)(5)(vi) Reporting)
UCMR 4
UCMR 5 Proposed Change
Specifies that laboratories must approve
analytical results in EPA's electronic data
reporting system within 120 days from the
sample collection date and specifies that PWS
have 60 days (from when the laboratory posted
the data to EPA's electronic data reporting
system) to review, approve, and submit their data
to the State and EPA
Laboratories would have 90 days from the
sample collection date to post and approve
analytical results in SDWARS for PWS review.
Large PWSs would have 30 days to review and
approve the analytical results posted to SDWARS
Reason for Change: States and other stakeholders have expressed interest in earlier
access to results. Laboratories and PWSs have demonstrated that shorter periods are
practical.
April 2021
U.S. Environmental Protection Agency
Slide 93 of 139
Break
(15 minutes)

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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Questions on the Presentation
•	Click on "+" next to "Questions" in
the control panel (Figure 1) to
submit questions/comments
•	Type a question in the box; click send
(Figure 2)
•	Submit general clarifying questions
throughout the webinar
•	Questions will be answered in the chat
box throughout the presentation
•	Common questions will be answered at
the end of each section
Figure 1
ฎ Polls (0/0)	IJTIฎ
ฉ
0 Chat	(a][x
Figure 2
1—1 Questions	[a|
[Enter a question for staff!
April 2021	U.S. Environmental Protection Agency	Slide 95 of 139
Specific Public Water System
& Laboratory Questions about UCMR 5
•	Public Water System (PWS)-Specific Questions
•	UCMR Sampling Coordinator@epa.gov
•	"My water system has five entry points, but we share three of
those points with another water system. Where do I sample?"
•	Laboratory-Specific Questions
•	UCMR Lab ApprovaiPepa.gov
•	"My laboratory merged with another laboratory since the last
UCMR cycle, can we change our laboratory ID?"
April 2021
U.S. Environmental Protection Agency	Slide 96 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Comments on the UCMR 5 Proposed Rule
•	Go to http://www.regulations.gov
•	Enter Docket ID EPA-HQ-GW-2020-0530
•	Click Search button
April 2021	U.S. Environmental Protection Agency	Slide 97 of 139
Comment Process/Accessing Docket
The UCMR 5 docket
should pop up on the
next screen
Click on the Comment
button below the
Proposed Rule
E3 PROPOSED RULE
Revisions to the Unregulated Contaminant Monitoring
Rule for Public Water Systems; Public Meeting
Comments Due May 10.2021
April 2021
U.S. Environmental Protection Agency
Slide 98 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Comment Process/Accessing Docket
•	Enter comment and all
required information
on next screen
•	Upload a document by
clicking on the
Browse... button
•	Click on the Submit
Comment button at
the bottom of the
page
April 2021	U.S. Environmental Protection Agency	Slide 99 of 139
Comment Process/Accessing Docket
•	Once submitted, comments cannot be edited or removed
•	Do not electronically submit any information you consider
to be Confidential Business Information (CBI)
•	Multimedia submissions (audio, video, etc.) must be
accompanied by a written comment
• Written comment is considered the official comment and
should include discussion of all points you wish to make
•	EPA public comment policy is at:
http://www.epa.gov/dockets/commenting-epa-dockets
•	Comments/questions/statements raised during this
meeting are not registered as official public comments
April 2021	U.S. Environmental Protection Agency	Slide 100 of 139
Write a Comment
Read Agency Guidelines | Commenter's Checklist
Comment"
Start typing comment here
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types include, bmp, docx. gif, jpg jpeg, pdf, png, pptx. rtf, sgml, tif, tiff. txt. wpd,
xlsx. xmL
Page 50 of 70

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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Process for EPA Approval of Laboratories
Supporting UCMR 5
Paul Grimmett, U.S. EPA
Office of Ground Water and Drinking Water
Standards and Risk Management Division
Technical Support Center
Overview
•	Laboratory Approval Program
•	General expectations
•	Contracts for small system sample analysis
•	Laboratory approval procedure
•	Laboratory Approval Manual
•	Maintaining Approval
•	Minimum Reporting Levels (MRLs)
For additional information, the document "UCMR 5 Laboratory
Approval Manual" is available in the docket
April 2021	U.S. Environmental Protection Agency	Slide 102 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
•	Program is OPEN
•	Laboratory Approval Program for UCMR 5 is expected to be similar to the
process used for all previous UCMR cycles
•	Only the EPA-approved laboratories can analyze UCMR samples collected
at PWSs
•	Approval is by method arid by individual laboratory locations
•	A laboratory may apply for approval for any method(s)
•	Laboratories need to meet:
•	UCMR 5 laboratory approval program criteria
•	Required equipment criteria
•	Laboratory performance criteria
•	Data reporting criteria (includes use of text file format to report to SDWARS)
•	Labs must be approved by EPA to support UCMR 5 even if already
certified or accredited by State/primacy entity for a particular method
being used in UCMR 5
April 2021	U.S. Environmental Protection Agency	Slide 103 of 139
Contracts for Small-System Sample Analysis
•	EPA would need significantly more laboratory support than normal
if UCMR 5 is finalized as proposed (based on the greater number
of small water systems specified by America's Water Infrastructure
Act of 2018 (AWIA))
•	In preparation for UCMR 5 monitoring, EPA anticipates soliciting
proposals and awarding contracts to laboratories to support small
system sample analysis prior to the end of the proficiency testing
(PT) program
•	Historically, laboratories awarded contracts by EPA have been
required to first be approved to perform all methods
•	interested laboratories are encouraged to start the Laboratory
Approval Program process early
April 2021	U.S. Environmental Protection Agency	Slide 104 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Laboratory Approval General Procedure
•	Step 1: Request to Participate
•	Step 2: Registration
•	Step 3: Application Package
•	Step 4: EPA Review of Application Package
•	Step 5: Proficiency Testing (PT)
•	Step 6: Written EPA approval
April 2021
U.S. Environmental Protection Agency	Slide 105 of 139
Step 1 - Request to Participate
•	Interested laboratories submit a written request to the
UCMR Lab Approval(5)epa.gov
•	EPA provides registration material
•	EPA provides a custom application package based on
registration information
April 2021
U.S. Environmental Protection Agency	Slide 106 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Step 2 - Registration
•	Complete registration sheet typically includes:
•	List of the UCMR methods for which the laboratory sought
approval
•	Laboratory information
•	Mailing and shipping address
•	Contact information
•	Based on a January 1, 2023, anticipated start for UCMR
5 sample collection, EPA anticipates that the final
opportunity for a laboratory to complete and submit the
necessary registration and application information will
be August 1, 2022
April 2021	U.S. Environmental Protection Agency	Slide 107 of 139
Step 3 - Application Package
•	Separate application for each method
•	Application typically required to include:
•	Proof of current drinking water laboratory certification (for select
compliance monitoring methods)
•	Personnel information
•	Quality Assurance (QA) information
•	Information regarding analytical equipment and sample handling
procedures
•	Data submission for each method (e.g., Initial Demonstration of
Capability (IDC) study, QC sample results, quantification reports)
•	Lab would receive a copy of the Laboratory Approval Manual
April 2021	U.S. Environmental Protection Agency	Slide 108 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Change Between UCMR 4 and UCMR 5 Proposal:
Laboratory Approval Registration and Application Deadlines
• Establish more flexible deadlines for laboratory approval
UCMR 4
UCMR 5 Proposed Change
To participate in the UCMR Laboratory
Approval Program, the laboratory must
complete and submit the necessary
registration forms within 60 days of final rule
publication, and necessary application
materials within 120 days of final rule
publication
Proposes that the laboratory complete and
submit registration and application materials
to EPA by August 1, 2022 to participate in the
UCMR Laboratory Approval Program
• Reason for change: Provide greater flexibility per laboratory
interest
April 2021	U.S. Environmental Protection Agency	Slide 109 of 139
Step 4 - Review of Application Package
• EPA reviews application package
•	If deficiencies are identified, EPA gives the lab an
opportunity to make corrective actions and submit new
application information
•	If all requested information is present and acceptable, EPA
notifies the laboratory that they are eligible to participate
in corresponding PT studies
April 2021	U.S. Environmental Protection Agency	Slide 110 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Step 5 - Proficiency Testing (PT)
•	EPA provides method-specific PT samples
•	EPA anticipates offering up to three (3) PT studies
prior to the publication of the final rule, and at least
two (2) studies after publication of the final rule
•	Plan to participate in PTs early if interested in
becoming a contract laboratory for small system work
•	As proposed, each laboratory would be required to:
•	Participate in at least two (2) PT studies for each method for
which it seeks approval
•	Pass a PT for each analyte in each method for which the
laboratory is seeking approval
•	Successfully report PT data to SDWARS using text file format
April 2021	U.S. Environmental Protection Agency	Slide 111 of 139
Step 6 - Written EPA Approval
•	After successful participation in a PT study for a specific method, EPA
expects to send the laboratory a notification letter listing the methods
for which approval is either:
Pending - pending promulgation of the final rule if the PT studies have been
conducted prior to that time
Granted - after promulgation of the final rule
•	Laboratories receiving pending approval are expected to be granted
approval without further action following promulgation of the final rule
if no changes have been made to the rule that impact the laboratory
approval program
EPA expects to contact the laboratory if changes are made between the proposed
and final rules that warrant additional action by the laboratory
•	A list of approved laboratories and associated methods will be posted
at: https://www.epa.gov/dwucmr
April 2021	U.S. Environmental Protection Agency	Slide 112 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Laboratory Approval Manual
•	Procedures for obtaining UCMR approval and procedures for
revocation of approval
•	Q.A requirements
•	QC requirements
8 MRLverification
•	Initial demonstration of capability
•	Initial calibration
•	Continuing calibration checks
8 Surrogate and internal standard criteria
•	Reagent blanks and fortified blanks
•	QC samples
•	Spiked field samples
8 Field blank criteria (if required by the method)
•	Sample handling requirements
April 2021	U.S. Environmental Protection Agency	Slide 113 of 139
Typical Criteria for Maintaining Approval
•	Adhere to QA/QC measures in the methods, rule language,
and the Laboratory Approval Manual
•	Post occurrence data and required QC data via SDWARS
within prescribed timeframe
•	Respond to inquires or requests from Laboratory Approval
Coordinator
•	Participate in and pass on-site and/or paper audits
April 2021
U.S. Environmental Protection Agency	Slide 114 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Reporting Limit Background
•	The minimum reporting level (MRL) is the minimum
quantitation level that, with 95% confidence, can be
achieved by capable analysts at 75% or more of the
laboratories nationwide using a specified analytical method
•	EPA establishes the MRL using data from multiple
laboratories performing "Lowest Concentration Minimum
Reporting Level" (LCMRL) studies to identify their capability
•	Each single-laboratory lowest concentration MRL (LCMRL)
is the lowest true concentration for which the future
recovery is predicted to fall, with high confidence (99%),
between 50 and 150% recovery
•	Lowest concentration that measurements of specified quality can
be made by a particular laboratory
•	Simultaneous application of precision and accuracy
April 2021	U.S. Environmental Protection Agency	Slide 115 of 139
MRLs
•	Established to achieve quality and consistency across all
UCMR laboratories, while allowing for appropriate
national laboratory capacity
•	MRLs are generally established as low as is feasible;
typically lower than current HRLs and health advisories
•	EPA will consider adjusting MRLs if there is confirmed and
recurring evidence that an MRL is
unattainable/impractical
April 2021	U.S. Environmental Protection Agency	Slide 116 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Proposed MRLs for UCMR 5
Analyte
CASRN
Analytical
Method
MRL
ll-chloroeicosafluoro-3-oxaundecane-l-sulfonic acid
(HCI-PF30UdS)
763051-92-9
EPA 533
0.005 pg/L
1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
39108-34-4
EPA 533
0.005 pg/L
1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
757124-72-4
EPA 533
0.003 pg/L
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
27619-97-2
EPA 533
0.005 pg/L
4,8-dioxa-3H-perfluorononanoic acid (ADONA)
919005-14-4
EPA 533
0.003 pg/L
9-chlorohexadecafluoro-3-oxanone-l-sulfonic acid (9CI-
PF30NS)
756426-58-1
EPA 533
0.002 pg/L
hexafluoropropylene oxide dimer acid (HFPO-DA)(GenX)
13252-13-6
EPA 533
0.005 pg/L
nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
151772-58-6
EPA 533
0.02 pg/L
April 2021	U.S. Environmental Protection Agency	Slide 117 of 139
Proposed MRLs for UCMR 5
Analyte
CASRN
Analytical
Method
MRL
perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
113507-82 "7
EPA 533
0.003 pg/L
perfluoro-3-methoxypropanoic acid (PFMPA)
377-73-1
EPA 533
0.004 pg/L
perfluoro-4-methoxybutanoic acid (PFMBA)
863090-89-5
EPA 533
0.003 pg/L
perfluorobutanesulfonic acid (PFBS)
375-73-5
EPA 533
0.003 pg/L
perfluorobutanoic acid (PFBA)
375-22-4
EPA 533
0.005 pg/L
perfluorodecanoic acid (PFDA)
335-76-2
EPA 533
0.003 pg/L
perfluorododecanoic acid (PFDoA)
307-55-1
EPA 533
0.003 pg/L
perfluoroheptanesulfonic acid (PFHpS)
375-92-8
EPA 533
0.003 pg/L
April 2021	U.S. Environmental Protection Agency	Slide 118 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Proposed MRLs for UCMR 5
Analyte
CASRN
Analytical Method
MRL
perfluoroheptanoic acid (PFHpA)
375-85-9
EPA 533
0.003 pg/L
perfluorohexanesulfonic acid (PFHxS)
355-46-4
EPA 533 0.003 pg/L
perfluorohexanoic acid (PFHxA)
307-24-4
EPA 533
0.003 |ig/l
perfiuorononanoic acid (PFNA)
375-95-1
EPA 533
0.004 pg/L
perfluorooctanesulfonic acid (PFOS)
1763-23-1
EPA 533
0.004 pg/L
perfluorooctanoic acid (PFOA)
335-67-1
EPA 533
0.004 pg/L
perfluoropentanesulfonic acid (PFPeS)
2706-91-4
EPA 533
0.004 pg/L
perfluoropentanoic acid (PFPeA)
2706-90-3
EPA 533
0.003 pg/L
April 2021	U.S. Environmental Protection Agency	Slide 119 of 139
Proposed MRLs for UCMR 5
Analyte
CASRN
Analytical
Method
MRL
perfluoroundecanoic acid (PFUnA)
2058-94-8
EPA 533
0.002 pg/L
n-ethyl perfluorooctanesulfonamidoacetic acid
(NEtFOSAA)
2991-50-6
EPA 537.1
0.005 pg/L
n-methyl perfluorooctanesulfonamidoacetic acid
(NMeFOSAA)
2355-31-9
EPA 537.1
0.006 pg/L
perfluorotetradecanoic acid (PFTA)
376-06-7
EPA 537.1
0.008 pg/L
perfluorotridecanoic acid (PFTrDA)
72629-94-8
EPA 537.1
0.007 pg/L
Lithium
7439-93-2
EPA 200.7, SM 3120
B, ASTM D1976-20
9 pg/L
April 2021	U.S. Environmental Protection Agency	Slide 120 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Stakeholder Statements & Discussion
•	Statements from Stakeholders that registered ahead
of time
•	Statements from Stakeholders that submit via the
chat function of the webinar (subject to the
availability of time)
Process for Submitting Public Comments

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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Comments on the UCMR 5 Proposed Rule
•	Go to http://www.regulations.gov
•	Enter Docket ID EPA-HQ-GW-2020-0530
•	Click Search button
April 2021	U.S. Environmental Protection Agency	Slide 123 of 139
Comment Process/Accessing Docket
The UCMR 5 docket
should pop up on the
next screen
Click on the Comment
button below the
Proposed Rule
E3 PROPOSED RULE
Revisions to the Unregulated Contaminant Monitoring
Rule for Public Water Systems; Public Meeting
Comments Due May 10.2021
April 2021
U.S. Environmental Protection Agency
Slide 124 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Comment Process/Accessing Docket
•	Enter comment and all
required information
on next screen
•	Upload a document by
clicking on the
Browse... button
•	Click on the Submit
Comment button at
the bottom of the
page
April 2021	U.S. Environmental Protection Agency	Slide 125 of 139
Comment Process/Accessing Docket
•	Once submitted, comments cannot be edited or removed
•	Do not electronically submit any information you consider
to be Confidential Business Information (CBI)
•	Multimedia submissions (audio, video, etc.) must be
accompanied by a written comment
• Written comment is considered the official comment and
should include discussion of all points you wish to make
•	EPA public comment policy is at:
http://www.epa.gov/dockets/commenting-epa-dockets
•	Comments/questions/statements raised during this
meeting are not registered as official public comments
April 2021	U.S. Environmental Protection Agency	Slide 126 of 139
Write a Comment
Read Agency Guidelines | Commenter's Checklist
Comment"
Start typing comment here
5000
Attach Files
You can attach up to 20 files, but each fUe cannot exceed 10MB Valid file
types include, bmp, docx. gif, jpg jpeg, pdf, png, pptx. rtf, sgml, tif, tiff. txt. wpd,
xlsx. xmL
Page 63 of 70

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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Closing Remarks
Thank you for participating in the UCMR 5 proposal discussion
If You Have Questions Following This Webinar
• UCMR Homepage
•	https://www.epa.gov/dwucmr
•	Contacts
•	Brerida Bowden: bowden.brenda(a)epa.gov
•	Melissa Simic: simic.melissa(5)epa.gov
•	Lab Approval Program
•	UCMR Lab Approval(5)epa,gov
•	UCMR Sampling Coordinator
•	UCMR Sampling CoordinatorfSepa.gov
•	Safe Drinking Water Information
•	https://www.epa.gov/ground-water-and-drinking-water/safe-drinking-water-
in formation
•	Meeting materials were sent to all registered participants
•	If you did not receive a copy, please email
UCMRwebinar@cadmusgroup.com and we will send you a copy
April 2021	U.S. Environmental Protection Agency	Slide 128 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Abbreviations and Acronyms
Abbreviations and Acronyms
•	HCI-PFBOUdS - ll-Chloroeicosafluoro-3-Oxauridecane-l-Sulfonic
Acid
•	4:2 FTS - 1H, 1H, 2H, 2H-Perfluorohexane Sulfonic Acid
•	6:2 FTS - 1H, 1H, 2H, 2H-Perfiuorooctane Sulfonic Acid
•	8:2 FTS - 1H, 1H, 2H, 2H-Perfluorodecane Sulfonic Acid
•	9CI-PF30NS - 9-Chlorohexadecafluoro-3-Oxanone-l-Sulfonic Acid
•	ADONA - 4,8-Dioxa-3H-Perfluorononanoic Acid
•	ATSDR - Agency for Toxic Substances and Disease Registry
•	AWIA - America's Water Infrastructure Act of 2018
•	BCAN - Bromochloroacetonitrile
•	CBI - Confidential Business Information
April 2021	U.S. Environmental Protection Agency	Slide 130 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Abbreviations and Acronyms
•	CCL - Contaminant Candidate List
•	CDR-Chemical Data Reporting
•	CDX-Central Data Exchange
•	CFR - Code of Federal Regulations
•	CWS - Community Water System
•	DBAN — Dibromoacetonitrile
•	DBP - Disinfection Byproduct
•	DBP-ICR - Disinfection Byproduct Information Collection Rule
•	DCAN - Dichloroacetonitrile
•	EPA - Environmental Protection Agency
•	EPTDS - Entry Point to the Distribution System
April 2021	U.S. Environmental Protection Agency	Slide 131 of 139
Abbreviations and Acronyms
•	FR - Federal Register
•	GenX - Trade Name for a Technology Used to Make High-
Performance Fluoropolymers Without the Use of PFOA
•	GWRMPs - Ground Water Representative Monitoring Plans
•	HA - Office of Water Health Advisory
•	Health Canada - Health Canada Guidelines for Canadian Drinking
Water Quality
•	HESD - Health Effects Support Document
•	HFPO-DA - Hexafluoropropylene Oxide Dimer Acid
•	IARC - International Agency for Research on Cancer
April 2021	U.S. Environmental Protection Agency	Slide 132 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Abbreviations and Acronyms
•	ICP-AES - Inductively Coupled Plasma- Atomic Emission
Spectrometry
•	IDC - Initial Demonstration of Capability
•	IRIS - Integrated Risk Information System
•	kg-Kilograms
•	L-Liter
•	LC/MS/MS - Liquid Chromatography/Tandem Mass
Spectrometry
•	LCMRL - Lowest Concentration Minimum Reporting Level
•	LOAEL - Lowest-Observed-Adverse-Effect Level
•	MAC - Maximum Acceptable Concentration
April 2021	U.S. Environmental Protection Agency	Slide 133 of 139
Abbreviations and Acronyms
•	MCLG - Maximum Contaminant Level Goal
•	MDBP - Microbial and Disinfection Byproduct
•	mg- Milligrams
•	MMWR - Center for Disease Control and Prevention's Morbidity
and Mortality Weekly Reports
•	MRL - Minimum Reporting Level
•	NAWQA - National Water-Quality Assessment
•	NCOD - National Contaminant Occurrence Database
•	NDAA - National Defense Authorization Act
•	NEtFOSAA - N-Ethyl Perfluorooctanesulfonamidoacetic Acid
•	NFDHA- Nonafluoro-3,6-Dioxaheptanoic Acid
April 2021	U.S. Environmental Protection Agency	Slide 134 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Abbreviations and Acronyms
•	NIRS - National Inorganics and Radionuclides Survey
•	NMeFOSAA- N-Methyl Perfluorooctanesulfonamidoacetic Acid
•	NOAEL- No-Observed-Adverse-Effect Level
•	NPDWRs - National Primary Drinking Water Regulations
•	NTNCWS - Non-Transient Non-Community Water System
•	OGWDW - Office of Ground Water and Drinking Water
•	PBT - Persistent, Bioaccumulative, and Toxic
•	PFAS - Per- and Polyfluoroalkyl Substances
•	PFBA - Perfluorobutanoic Acid
•	PFBS - Perfluorobutanesulfonic Acid
April 2021	U.S. Environmental Protection Agency	Slide 135 of 139
Abbreviations and Acronyms
•	PFDA - Perfluorodecanoic Acid
•	PFDoA - Perfluorododecanoic Acid
•	PFEESA- Perfluoro (2-Ethoxyethane) Sulfonic Acid
•	PFHpA Perfluoroheptanoic Acid
•	PFHpS - Perfluoroheptanesulfonic Acid
•	PFHxA - Perfluorohexanoic Acid
•	PFHxS - Perfluorohexanesulfonic Acid
•	PFMBA - Perfluoro-4-Methoxybutanoic Acid
•	PFMPA- Perfluoro-3-Methoxypropanoic Acid
•	PFNA-Perfluorononanoic Acid
April 2021	U.S. Environmental Protection Agency	Slide 136 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Abbreviations and Acronyms
•	PFOA - Perfluorooctanoic Acid
•	PFOS- Perfluorooctanesulfonic Acid
•	PFPeA- Perfluoropentanoic Acid
•	PFPeS - Perfluoropentanesulfonic Acid
•	PFTA - Perfluorotetradecanoic Acid
•	PFTrDA - Perfluorotridecanoic Acid
•	PFUnA - Perfluoroundecanoic Acid
•	PPRTV - Provisional Peer-Reviewed Toxicity Values
•	PT - Proficiency Testing
•	PWS - Public Water System
April 2021	U.S. Environmental Protection Agency	Slide 137 of 139
Abbreviations and Acronyms
•	PWSID - Public Water System Identification Code
•	QA - Quality Assurance
•	QC - Quality Control
•	RfD - Reference Dose
•	SDWA - Safe Drinking Water Act
•	SDWARS-Safe Drinking Water Accession and Review System
•	SPE - Solid Phase Extraction
•	TCAN-Trichloroacetonitrile
•	TNCWS - Transient Non-Community Water System
•	TOF-Total Organic Fluorine
April 2021	U.S. Environmental Protection Agency	Slide 138 of 139
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Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 5)
Abbreviations and Acronyms
TSCA - Toxic Substance Control Act
UCM - Unregulated Contaminant Monitoring
UCMR - Unregulated Contaminant Monitoring Rule
ug - Micrograms
USGS - United States Geological Survey
WHO - World Health Organization
April 2021
U.S. Environmental Protection Agency
Slide 139 of 139
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